modify agent-rdp automate run to execute any cli command

[rgl]

Currently, agent-rdp automate run '$PSVersionTable' --wait is hard-coded to use powershell.exe:

agent-rdp/crates/agent-rdp-daemon/src/automation/scripts/lib/actions.ps1

Lines 542 to 544 in e4c45f9

	$startInfo = New-Object System.Diagnostics.ProcessStartInfo
	$startInfo.FileName = "powershell.exe"
	$startInfo.Arguments = "-NoProfile -Command `"$command $commandArgs`""

That artificially limits what can be executed.

Can we instead run any command? For example, I want to use pwsh.exe instead of powershell.exe.

If that's welcomed, I can try to create a PR.